Ответ:

  1. \(3(x-2)=x+2\)
    \(3x-6=x+2\)
    \(2x=8\)
    \(x=4\).
  2. \(5-2(x-1)=4-x\)
    \(5-2x+2=4-x\)
    \(3=x\)
    \(x=3\).
  3. \((7x+1)-(9x+3)=5\)
    \(7x+1-9x-3=5\)
    \(-2x-2=5\)
    \(-2x=7\)
    \(x=-3,5\).
  4. \(3.4+2.3y=7(y-2.3)\)
    \(3.4+2.3y=7y-16.1\)
    \(19.5=4.7y\)
    \(y=\frac{195}{47}\).
  5. \(0.27-(2-y)=2.3-0.3(y-6)\)
    \(y-1.73=4.1-0.3y\)
    \(1.3y=5.83\)
    \(y=\frac{583}{130}=4.484615\ldots\).
  6. \(\frac{2}{3}(\frac{1}{3}x-\frac{1}{2})=4x+2\frac{1}{2}\)
    Умножим на 6:
    \(2(\frac{x}{3}-\frac{1}{2})=24x+15\)
    \(\frac{2x}{3}-1=24x+15\)
    \(-16=\frac{70x}{3}\)
    \(x=-\frac{24}{35}\).

Ответ: 1) \(x=4\); 2) \(x=3\); 3) \(x=-3,5\); 4) \(y=\frac{195}{47}\); 5) \(y=\frac{583}{130}\); 6) \(x=-\frac{24}{35}\).